package com.yxj03;

import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;

import java.io.*;

/*
* 四种方式实现复制视频，并记录每种方式复制视频的时间
* 1.基本字节流一次读写一个字节      共耗时：11716毫秒
* 2.基本字节流一次读写一个字节数组   共耗时：22毫秒
* 3.字节缓冲流一次读写一个字节      共耗时：27毫秒
* 4.字节缓冲流一次读写一个字节数组   共耗时：6毫秒
* */
public class CopMp4Demo {
    public static void main(String[] args) throws IOException{
        //记录开始时间
        long startTime = System.currentTimeMillis();
        //每种方式的实现方法
        //method1();
        //method2();
        //method3();
        method4();
        //记录结束时间
        long endTime = System.currentTimeMillis();
        System.out.println("共耗时："+(endTime-startTime)+"毫秒");
    }
    //基本字节流一次读写一个字节
    public static void method1() throws IOException {
        FileInputStream fis = new FileInputStream("D:\\桌面\\视频.mp4");
        FileOutputStream fos = new FileOutputStream("D:\\Ccode\\jdata-structure\\ByteStream9\\字节流复制图片.mp4");

        int by;
        while((by=fis.read()) != -1) {
            fos.write(by);
        }
        fos.close();
        fis.close();
    }

    //基本字节流一次读写一个字节数组
    public static void method2() throws IOException {
        FileInputStream fis = new FileInputStream("D:\\桌面\\视频.mp4");
        FileOutputStream fos = new FileOutputStream("D:\\Ccode\\jdata-structure\\ByteStream9\\字节流复制图片.mp4");

        byte[] bys = new byte[1024];
        int len;
        while((len=fis.read(bys)) != -1) {
            fos.write(bys,0,len);
        }
        fos.close();
        fis.close();
    }

    //字节缓冲流一次读写一个字节
    public static void method3() throws IOException {
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D:\\桌面\\视频.mp4"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("D:\\Ccode\\jdata-structure\\ByteStream9\\字节流复制图片.mp4"));

        int by;
        while((by=bis.read()) != -1) {
            bos.write(by);
        }

        bis.close();
        bos.close();
    }

    //字节缓冲流一次读写一个字节数组
    public static void method4() throws IOException {
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D:\\桌面\\视频.mp4"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("D:\\Ccode\\jdata-structure\\ByteStream9\\字节流复制图片.mp4"));

        byte[] bytes = new byte[1024];
        int len;
        while((len=bis.read(bytes)) != -1) {
            bos.write(bytes,0,len);
        }

        bis.close();
        bos.close();
    }
}
